System for measuring optical waveguide fiber diameter

Details System for measuring optical waveguide fiber diameter System for measuring optical waveguide fiber diameter

1979-09-04

1981-07-28

Lindsay, Jr., Robert L.

Glass manufacturing

Processes

With shaping of particulate material and subsequent fusing...

65 2, 65 13, 65 29, 65160, 65163, 356 731, C03B 3702

Patent

active

042808278

ABSTRACT:
The diameter of an optical fiber being drawn is monitored and controlled by an optical measuring technique. An electrical input signal is generated from the fringe pattern produced by directing a laser beam onto the fiber. The input signal is connected to appropriate terminals of first, second, third and fourth comparators. The input signal is delayed 180.degree. to provide an input signal to the remaining two terminals of the first and second comparators and is delayed 90.degree. to provide an input signal to the remaining terminals of the third and fourth comparators. The output pulses from the comparators are shaped, summed and counted to provide a control signal for the fiber drawing apparatus.

REFERENCES:
patent: 3982816 (1976-09-01), Watkins
patent: 4046536 (1977-09-01), Smithgall
"High Speed Non-contact fiber diameter measurement using forward light scattering", Smithgall et al., Applied Optics, vol. 16 #9, Sep. 1977, pp. 2395-2402.

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